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Old 09-06-2018, 09:22 PM
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Default Running rough

I have a 93 Buick LeSabre with the 3800 series 1 need help.I just recently replaced the crank shaft sensor and the camshaft position sensor and car still running rough was told that it might be the MAP sensor need help locating it,als tried to connect my code scanner and no power at connection checked fusses none blown what can you suggest
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Old 09-06-2018, 10:30 PM
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No map sensor. The L27 uses a MAF sensor exclusively.

is the service engine soon light on? If not, have you confirmed the light works?
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Old 09-06-2018, 10:35 PM
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But, if unmetered air is being ingested, such as through a vacuum leak, it could cause the issue you are describing.

Given the car is 25 years old, there is a high likelihood of degraded or broken vacuum lines
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Old 09-07-2018, 12:26 AM
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How many miles on it?

How many miles have you owned it?

How long have you owned it?

When were the spark plugs replaced last?

When were the spark plug wires replaced last?

Is the check-engine light on?
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Old 09-07-2018, 07:33 AM
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Originally Posted by CathedralCub View Post
How many miles on it?

How many miles have you owned it?

How long have you owned it?

When were the spark plugs replaced last?

When were the spark plug wires replaced last?

Is the check-engine light on?
There'* 219000 miles i have roughly put about 25000 to 30000 miles the plugs were changed about 2yrs ago I have not changed the plug wires yet.No the check engine light is not on. Here'* what it'* doing when you first crank up the vehicle it runs fine but after a few miles it starts running rough I've also replaced all the vacuum lines
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Old 09-07-2018, 08:51 AM
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Is the catalytic converter original? Have you checked fuel pressure?
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Old 09-07-2018, 09:06 AM
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Not sure about the catalytic converter, the fuel pressure is at 46 psi
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Old 09-07-2018, 09:17 AM
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Originally Posted by Tonysmith View Post
. Here'* what it'* doing when you first crank up the vehicle it runs fine but after a few miles it starts running rough
Typical ICM failure is my guess.
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Old 09-07-2018, 09:23 AM
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Would that cause it to stall on occasion
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Old 09-07-2018, 09:25 AM
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Yes it would.
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